Case study:Restoration of Kostonjoki River

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Location: 65° 35' 20.76" N, 28° 13' 9.01" E

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Project overview

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Status	Complete
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Themes	Economic aspects, Fisheries, Habitat and biodiversity, Social benefits
Country	Finland
Main contact forename	-
Main contact surname	-
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Contact organisation	Finnish Environment Institute
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Project summary

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Kostonjoki River is one of the tributaries of the River Iijoki. The River Kostonjoki was dredged for timber floating like many other tributaries of the River Iijoki. Before dredging in 1956-1958 there were 105 hectares of rapids and riffles in the Kostonjoki River. After dredging most of the riffles and rapids were destroyed and habitats of the migrating fish destructed. Restorations of the Kostonjoki River took place in 2005-2012 as the aim of setting the condition of the water system closer to it´s natural state to enable the fish migration. Objective of the restorations was to create pool-riffle variation, add natural water levels so that the dried parts of the river would be re-watered and add stones and gravel back in the river to create habitats for fish. Restorations were successful. Rapid and riffle areas of the Kostonjoki River grew 60% after restorations and densities of migrating fish increased.

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Catchment and subcatchment

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Site

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Name	The Kostonjoki River
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Pre-project morphology	Straightened, Over-widened
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Heavily modified water body	No
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Protected species present	Yes
Invasive species present	Yes
Species of interest	Trouts, European grayling, crabs, mussels
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Project background

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Reasons for river restoration

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Mitigation of a pressure
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Measures

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